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visitfiles.go
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visitfiles.go
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// Copyright 2022 Namespace Labs Inc; All rights reserved.
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
package fnfs
import (
"context"
"io"
"io/fs"
"github.com/mattn/go-zglob"
"namespacelabs.dev/foundation/internal/bytestream"
)
type File struct {
Path string
Contents []byte
}
type VisitFS interface {
VisitFiles(context.Context, func(string, bytestream.ByteStream, fs.DirEntry) error) error
}
func VisitFiles(ctx context.Context, fsys fs.FS, visitor func(string, bytestream.ByteStream, fs.DirEntry) error) error {
if vfs, ok := fsys.(VisitFS); ok {
return vfs.VisitFiles(ctx, visitor)
}
return WalkDir(fsys, ".", func(path string, d fs.DirEntry) error {
if err := ctx.Err(); err != nil {
return err
}
if d.IsDir() {
return nil
}
fi, err := d.Info()
if err != nil {
return err
}
return visitor(path, reader{fsys, path, fi.Size()}, d)
})
}
type reader struct {
fsys fs.FS
path string
size int64
}
func (b reader) ContentLength() uint64 { return uint64(b.size) }
func (b reader) Reader() (io.ReadCloser, error) {
return b.fsys.Open(b.path)
}
type MatcherOpts struct {
IncludeFiles []string
IncludeFilesGlobs []string
ExcludeFilesGlobs []string
}
type PatternMatcher struct {
requiredFileMap map[string]struct{}
includeGlobs []HasMatch
excludeGlobs []HasMatch
}
func NewMatcher(opts MatcherOpts) (*PatternMatcher, error) {
m := &PatternMatcher{}
if len(opts.IncludeFiles) > 0 {
m.requiredFileMap = map[string]struct{}{}
for _, f := range opts.IncludeFiles {
m.requiredFileMap[f] = struct{}{}
}
}
for _, glob := range opts.IncludeFilesGlobs {
x, err := zglob.New(glob)
if err != nil {
return m, err
}
m.includeGlobs = append(m.includeGlobs, x)
}
for _, glob := range opts.ExcludeFilesGlobs {
x, err := zglob.New(glob)
if err != nil {
return m, err
}
m.excludeGlobs = append(m.excludeGlobs, x)
}
return m, nil
}
func (m *PatternMatcher) Excludes(name string) bool {
for _, m := range m.excludeGlobs {
if m.Match(name) {
return true
}
}
return false
}
func (m *PatternMatcher) Includes(name string) bool {
if _, ok := m.requiredFileMap[name]; ok {
return true
}
for _, glob := range m.includeGlobs {
if glob.Match(name) {
return true
}
}
return len(m.requiredFileMap) == 0 && len(m.includeGlobs) == 0
}
type HasMatch interface {
Match(name string) bool
}